I can't tell...I just feel it or not. But I can be wrong though lol

It's like I always say: open door pooping, that's when you know they are not going anywhere

You would need to read their mind

It's in their kiss!

Survive a catastrophic accident that ruins your appearance and most of your function and see if they love you as much.... oops did I just ruin love? :o

I had a friend who once said, if you want to know if someone really loves you, yell at them or tell them off or something like that (I forget exactly what he said), and if they cry, then they love you. I think that's a real dick/heartless move though.